I can confirm cycles wil be at 0 (zero) when replacing batteries, I replaced my battery on my Pixel 7 a couple of months ago.
I also ordered two replacement batteries from iFixit for my two family members that have a Pixel 6a with over 600 cycles to prevent fire hazards. (Make sure you download the replacement manual (PDF) from their site as well)
You can check the current battery capacity in the settings menu to see if it needs a replacement.
Btw, make sure you don't unlock the battery connector with a METAL tool, use a PLASTIC one. (It got me some sparks on the Pixel 7, jikes, sometimes I can be a bit of a moron doing these things, lol)